Mobile: redesign, onboarding, QR codes, logo, Spotify setup

- Redesign matching the web: album-art backdrops, Reanimated equalizer,
  spinning live ring, drifting ambient background, gradient buttons with
  spring press feedback and haptics, Space Grotesk headings, animated feed
  (enter + layout transitions); fix invisible tab labels
- Four-step onboarding for new accounts: which app you listen with (sets
  where songs open), the matching share setup, find friends (search,
  scan, invite), and a featured song. Skippable; stored server-side
- QR codes: My code (share link) and an in-app scanner (camera only, no
  microphone permission)
- Spotify setup via Last.fm or ListenBrainz with guided linking; Android
  shares Spotify automatically through the phone reader
- New logo as app icon, adaptive/monochrome icon and splash
- app.config.ts allows cleartext only for local http:// test builds

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MzFywujuH9TiuXbr9vjoX8

apps/mobile/app.json

@@ -8,7 +8,7 @@
     "scheme": "musicshare",
     "userInterfaceStyle": "dark",
     "ios": {
-      "icon": "./assets/expo.icon",
+      "icon": "./assets/images/icon.png",
       "bundleIdentifier": "tech.chrisedwards.musicshare",
       "infoPlist": {
         "NSAppleMusicUsageDescription": "musicshare shows your friends what you play in Apple Music, and opens their songs for you."
@@ -16,7 +16,7 @@
     },
     "android": {
       "adaptiveIcon": {
-        "backgroundColor": "#0e0f13",
+        "backgroundColor": "#1a0a4a",
         "foregroundImage": "./assets/images/android-icon-foreground.png",
         "backgroundImage": "./assets/images/android-icon-background.png",
         "monochromeImage": "./assets/images/android-icon-monochrome.png"
@@ -30,9 +30,17 @@
       [
         "expo-splash-screen",
         {
-          "backgroundColor": "#0e0f13",
+          "backgroundColor": "#0b0820",
           "image": "./assets/images/splash-icon.png",
-          "imageWidth": 76
+          "imageWidth": 150
+        }
+      ],
+      [
+        "expo-camera",
+        {
+          "cameraPermission": "musicshare uses the camera to scan friends' QR codes.",
+          "microphonePermission": false,
+          "recordAudioAndroid": false
         }
       ]
     ],